Refrigerant compressor



May 25, 1937.

w. D. DRYSDALE 2,081,354

REFRIGERANT COMPRES SOR 2 Sheets-Sheet 1 Filed Nov. l, 1934 Vizi-@5,6

2 Sheets-Sheet 2 I l i M Illlllllllllllllll May 25, 1937.

f1 tva/174% retenait/lary! 2s. 1937- UNITED STATES PATENT OFFICE2,031.354 nEFmGEnAN'r ooMraEsson william n. Drysdale, Munto1emens;'men.,as-

signor to Walter J. Sugden, Boston, Mass.

"Application November 1, 1934, semi No. 750,982

. 4 claims'. '(ol. 23o-5s) pump. The objects are to provide for aninterchangeable mounting of pumps of different capacities to suitvarious conditions without change' of the other elements and to providefor the convenient assembly and alignment of the motor and the shaftbearing.

The invention will best be understood by reference to the followingdescription when taken in connection with the accompanying drawings ofone specific `embodiment thereof, whi1e its scope will be pointed outmore particularly in the appended claims.

In the drawings:

Fig. 1 is a. horizontal, sectional view of `a refrigerant compressorembodying the invention;

Fig. 2 is an end elevation of the same with'the cover removed and with aportion of the pump shown in vertical section; and Fig. 3 is a sectionalview on line 3-3 of Fig. 2.

Referring to the drawings and to the embodiment of the invention"illustrated therein, there is shown a refrigerant compressor comprisinga housing 5, herein of generally cylindrical form, having oneendpermanently closed by` an in tegral head 1 and the other by a cover9.' 'I'he housing may conveniently begin the form of a drawn steelshell. v

suitably secured as by welding to the internal, 'circumferential surfaceof the housing and extending inwardly therefrom, is an abutment I Iwhich plays an important part in the mounting of the entire mechanism inthe housing. Next in order. comes an electric motor comprising a rotor4I3 and af stator I5, the latter having secured thereto .as by welding aband l1 which in` effect is a`partof the stator. The external surface ofthis band engages lthe internal, lcircum.-

.g ferential surface of the housing and thus predetermines the positionof the axis of the stator. One end of the band engages the abutment Ilendwise and the abutment therefore predetermines ithe positii of theband lengthwise of the axis.

,Next in order is a bearing llll whose external surface engages theinternal, circumferential- One end of this bearing engages' the adjacentend ofl the band n and thus Ame positie bearing lengthwise of 'the axisis predetermined. The bearing and the band (in eiecta partfof thestator) are secured to each other and tothe housing as by'two longscrews 2l which n lextend through the bearing through the openings 23provided in the statorl and into -the abutment Il, into which the screwsare threaded.

. The screws are providedat their outer ends-with heads 25 by means ofwhich they may be turned to clamp the bearing and 'the band endwiseagainst each other and against the abutment. The whole structure may bedismounted from the housing simply by the removal' of vthese screws. l

-The next in order is the pump which, as shown in Figs. 2 and 3,comprises a cylinder 21 having a. piston 29 working therein, saidcylinder, as shown, having a lateral intake port 3l which is covered anduncovered by the piston and which is at all times in communication. witha chamber 33 into which the gaseous refrigerant enters throughran inlet35. In this example the piston is reciprocated by a connecting `rod -31whose upper end is connected to the piston by a wrist-pin 39 and whoselower end is connected to a crankpin I which is carried by a shaft I3.This shaft (see Fig. 1) turns in a boss 45 vpresented by the bearing I9,and to this shaft the rotor 'is suitably securedv as by a lkey 41 and anut I9, the latter having screw-threaded'engagement lwith a re'- ducedportion 5| -of the shaft. The cylinder is opposition to spring 65,'thevgas passingl thence through an outlet 61 to a pipe 69 which leads to theexterior of the housing.

The cylinder, as shown, is provided with two of the lateral extensionsor arms 1i which engage the adjacent end face of the bearing I9 and areAclamped against lthe latter as by cap screws 13,

the removal of which enables the pump to be dismounted withoutdisturbing the bearing or the motor. Thus it is possible easily tochange the capacity of the compressor by the substitution of cylindersand pistons of different diameters.

construction has several other advantages. It provides a bettermanufacturing and assembling Job than in prior constructions wherein thecylinder and main bearing are in one piece. It is possible to remove thecylinder, connecting rod, piston and cylinder head without removing themain bearing and the motor. If there is any defect in the cylinder, itis unnecessary to replace anything but the cylinder itself. The same istrue of replacement because of wear. The most important of theseconsiderations, however, is the ability to obtain different displacementcapacities for the pump by changing cylinders and pistons.

Having thus described one embodiment of the invention, but Withoutlimiting myself thereto, what I claim and desire by Letters Patent tosecure is:

1. A motor-compressor unit comprising, in combination, a housing havingan internal, circumferential surface and an internal abutment extendinginwardly from said surface, a motor housed within said housing andcomprising a rotor and a stator, a band about and supporting said statorand having one end engaging said abutment, the external surface of saidband engaging said internal, circumferential surface, a bearing housedWithin said housing and having one end engaging the other end of saidband, the external surface of said bearing engaging said internal,circumferential surface, fastening elements extending through saidbearing and through said stator within said band and havingscrew-threaded engagement with said abutment, a cylinder engaging theother end of said bearing, means by which said cylinder is detachablysecured to said bearing, a piston working in said cylinder, a shaftturning in said bearing and secured to and driven by said rotor, andmeans presenting a driving connection between said piston and saidshaft.

2. A motor compressor unit comprising, in combination, a housing havinga closed end and having an opposite end provided with an openingnormally closed by a cover, a motor comprising a rotor and a statorhoused within said housing, c

a shaft extending through said rotor and provided with a shoulder andwith a screw-thread adjacent said closed end, a nut threaded onto saidscrew-thread and cooperating with said shoulder to secure said rotor tosaid shaft, a bearing for said shaft housed within said housing, acompressor housed within said housing and having a connection with saidshaft constructed for connection with and disconnection from said shaftWithout disturbing said shaft, securing means to secure said compressorto said bearing, said securing means being accessible through saidopening to attach said compressor to and to detach the same from saidbearing without disturbing said bearing, and means to secure saidbearing to said stator and to secure said stator to said housing.

3. A motor-compressor unit comprising, in combination, a housingpresenting an abutment at one end and having an opening at its oppositeend closed by a cover, a motor, a bearing, and a compressor housedwithin said housing and serially arranged endwise in the order namedwith said motor adjacent said abutment and with said compressor adjacentsaidcover, said motor comprising a rotor and a stator, a shaft mountedin said bearing and secured to said rotor, said shaft and saidcompressor being supported by said bearing independently of said cover,driving means between said compressor and said shaft constructed andarranged for connecting said compressor with and disconnecting th samefrom said shaft without disturbing said shaft or said bearing, securingmeans to secure said compressor to said bearing, said securing meansbeing accessible through said opening to attach said compressor to andto detach the same from said bearing without disturbing said bearing,and means to secure said bearing endwise to said stator and to securesaid stator endwise to said abutment. I

4. A motor-compressor unit comprising, in combination, a housing havinga closed end and having an opposite end provided with an openingnormally closed by a cover, a motor comprisl ing a rotor and a statorhoused within said housing, a shaft extending through said rotor andprovided with a shoulder and with a screw-thread adjacent said closedend, a nut threaded onto said screw-thread and cooperating with saidshoulder to secure said rotor to said shaft, a bearing for said shafthoused within said housing, a compressor housed within said housing andhaving a connection with said shaft constructed for connection withanddisconnection from said shaft without disturbing said shaft, securingmeans including at least one screw having a head accessible through saidopening and having a shank threaded into said bearing to attach saidcompressor to and to detach the same from said bearing' withoutdisturbing said bearing, said shaft being supported by said bearingindependently of said cover, and means to secure said bearing to saidstator and to secure said stator to said housing.

WILLIAM D. DRYsDALE.

